Undervolting/Underclocking the 750 Ti to pull less power

[parsa_strife]

Hello, I'm currently on a 50W TDP XFX 9400 GT 1GB DDR2. It's overclocked from 550MHz to 650MHz on core, and from 400MHz to 520MHz on memory. So I'm assuming It's pulling around 55W under load?
I have a shitty non-branded 230W PSU that's been working for about 4 years+ without problems. I used to have a Pentium Dual E2200 OC'd to 3GHz tho. A few months ago I upgraded to a Xeon E5440 (aka Q9550) which is running at stock.
Anyway, I'm planning to upgrade to a GTX 750 Ti for the time being (you know... 9400 GT... Pain...) untill new graphics cards come out and I build a new system for myself.
First thing I will be upgrading (after GFX card) is gonna be my PSU so I'm only planning to run this 750 Ti on this PSU for about 2 months max.

I know my PSU is shit and I need 18-20A for the 750 Ti on the 12V rail while my PSU only got 14A on the 12V rail.
Now my question is, can I undervolt and underclock the 750 Ti (60W TDP) to pull around 40-50W to get away with this PSU untill I get a better PSU in 1-2 months?

 

[RememberThe5th]

Well my option would be rather buying used PSU http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html , you can Search by this list on your local site where you can find used (just be carefull when buying).My recommended psu for your budged would be VS series of corsair, its cheap used 30 or 40€ or maybe even less.

 

[parsa_strife]

Only thing I can afford is some refurbished PSUs but even for that I'll have to wait for 2-3 weeks. So I need to know if I can buy the 750 Ti now and undervolt/underclock it

 

[RememberThe5th]

I probably wouldnt underclock your 750ti cause psu is only 230W (maybe lower cause its Generic? it can give true 180W or less). Xeon pulls 120W soo there aint room to fit 750Ti.Well if you have still old CPU you can swap it for xeon and stick to Pentium and 750Ti.

 

[parsa_strife]

Xeon E5440 actually pulls 80W under load. 750 Ti uses 60W under load which is actually only 10W more than my 9400 GT at stock.
So I think by undervolting the 750 Ti I should be able to get away with it? Even if I undervolt the 750 Ti enough to only use around 30W that will be worlds faster than my 9400 GT lol